spm build 打包css文件含有@import url 失败

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spm build 打包css文件含有@import url 失败
C:\Program Files (x86)\nodejs\node_modules\spm\node_modules\spm-build\node_modul
es\gulp-spm\node_modules\css-imports\index.js:27
imports(str).forEach(function(r){
^
TypeError: Cannot read property 'path' of undefined
at C:\Program Files (x86)\nodejs\node_modules\spm\node_modules\spm-build\nod
e_modules\gulp-spm\lib\plugin\css.js:92:27
at C:\Program Files (x86)\nodejs\node_modules\spm\node_modules\spm-build\nod
e_modules\gulp-spm\node_modules\css-imports\index.js:28:33
at Array.forEach (native)
at map (C:\Program Files (x86)\nodejs\node_modules\spm\node_modules\spm-buil
d\node_modules\gulp-spm\node_modules\css-imports\index.js:27:16)
at imports (C:\Program Files (x86)\nodejs\node_modules\spm\node_modules\spm-
build\node_modules\gulp-spm\node_modules\css-imports\index.js:9:18)
at transportFile (C:\Program Files (x86)\nodejs\node_modules\spm\node_module
s\spm-build\node_modules\gulp-spm\lib\plugin\css.js:68:16)